增强了实体数据类的持久化透明(persistence ignorance)能力。

Increased persistence ignorance in entity data classes.

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显然，现在还有一些限制，当某人想暴露同一个资源的多个版本的时候，却无法复制它的实体数据。

Obviously this has some limitations when one want to expose multiple versions of the same resource without duplicating the entity data.

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分析城市公交网络的各种空间实体数据和属性数据，建立了基于GIS的公交网络信息数据库。

The paper analyses the spatial data and attribute data of urban transit network and builds the urban transit information database based on GIS technology.

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